The Sensex at the Bombay Stock Exchange, which had slumped more than 400 points in early afternoon deals, continued weak, to stand 391 points, or 1.9 per cent in the red, and fall below the 20,000 level, at 19,918, a short while ago. Earlier, the Sensex had opened 64 points lower, at 20,246 in morning trade, on profit-booking and subdued Asian markets. Other Asian bourses were mostly lower, today, with key benchmark indices in Japan, Singapore, South Korea, Indonesia and Hong Kong losing between 0.3 per cent and 0.9 per cent, and China's benchmark index slipping as much as 3 per cent. Asian stocks fell as an interest rate hike in South Korea added to speculation that China will also tighten monetary policy to cool inflation.Over at the Interbank Foreign Exchange Market, the rupee initially gained 14 paise, to 45.10 against the dollar in opening trade. But the rupee later softened, to fall 5 paise, at 45.29 against the dollar, in afternoon deals.